Freiburg 2024 – scientific programme

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A: Fachverband Atomphysik

A 25: Poster IV

A 25.30: Poster

Wednesday, March 13, 2024, 17:00–19:00, Tent A

Active stabilization of a standing wave in a femtosecond enhancement cavity with a cw laser interferometer — •Lukas Matt, Tobias Heldt, Lennart Guth, Jan-Hendrik Oelmann, Thomas Pfeifer, and José R. Crespo López-Urrutia — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg

To study the strong field emission of electrons from metallic nanotips or noble gases, we have developed a passive enhancement cavity for a frequency comb at 1039 nm [1]. Two different coupling arms into the ring cavity allow counter-propagating pulses to be timed to collide at the focus of the cavity forming a standing wave. Different thermal fluctuations and vibrations of the two coupling paths limit the stability of the standing wave. To maintain a stable phase relationship between the standing wave and the nanotip target we designed an active stabilization system using a narrow-band cw laser at 976 nm forming a Michelson interferometer. The interference signal allows to lock the length difference using Pancharatnam’s phase via a piezo-actuated mirror [2]. We present the technical realization of this system.
[1] J.-H. Oelmann et al., Rev. Sci. Instrum., 93(12), 123303 (2022).
[2] M. U. Wehner et al., Opt. Lett., 22(19), (1997)